Results 251 to 260 of about 25,571 (294)

Lithium abundances in SC stars

Publications of the Astronomical Society of the Pacific, 1990
Spectra between 6685 and 6720 A have been synthesized to match high-resolution observations of eight SC stars and two S stars to study the Li 6707 A line. In addition, lines for eleven additional elements and the CN molecule were detected. Li/metals abundance ratios ranged from - 1.15 to - 1.75.
T. Kipper, George Wallerstein
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Lithium Isotopic Abundances in Stars

2008
The Li isotope ratio, 6Li/7Li, in stars can be determined from the isotopic shift in the Li I 670.8 nm resonance line. Because of the small effect this however requires truly precision spectroscopy: spectral resolving power R ≥ 105 and S/N ≥ 500. In this review we discuss the method and what one can learn from Li isotopic abundances in terms of Big ...
Poul Erik Nissen, Martin Asplund
openaire   +1 more source

The lithium abundance in stars

Space Science Reviews, 1991
The observations of Li abundances in pre-Main-Sequence, Main-Sequence (Population I and II), sub-giant, and giant stars are reviewed in order to show how Li can be used as a constraint on stellar hydrodynamics and in particular on particle transport processes in stars.
Georges Michaud, Paul Charbonneau
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Lithium in the barium stars

Publications of the Astronomical Society of the Pacific, 1984
Analysis of high resolution (lambda/Delta-lambda - 150,000) spectra of classical barium giants reveals that an unidentiifed line is a major contribtor to the stellar absorption feature at 6707.8 A attributed previously to a blend of CN lines and the Li I resonance doublet.
M. H. Pinsonneault   +2 more
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Lithium in Old Binary Stars

1995
A detailed analysis of high resolution, high signal to noise spectra of twenty metal deficient binaries (−2.9 < [Fe/H] < −0.4) with periods ranging from 220d to 1.8d is presented. For most of the stars, in addition to the Li abundance determination, a careful determination of the stellar physical parameters (Teff, log g, [Fe/H]) has been performed. For
L. Pasquini, M. Spite, F. Spite
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Lithium Abundance in Pop. II Stars

Space Science Reviews, 1998
The relation between the lithium abundance observed in Population II stars and the primordial abundance, is still an open question (see Cayrel and Duncan, this meeting). A few recent results are discussed. HIPPARCOS data show that the standard model of stellar evolution can explain the 6Li detection in HD 84937, suggesting a negligible depletion of 7Li.
F. Spite, M. Spite, V. Hill
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